5, 9, 17, 33, ?, 129, 257 - Testpoint

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5, 9, 17, 33, ?, 129, 257

64
63
66
65
61

Explanation

5 → 9 → 17 → 33 → ? → 129 → 257

Step 1: Find the rule

Each term follows:

$Next = (Previous \times 2) - 1$

Check:

$5 times 2 - 1 = 9$
$9 \times 2 - 1 = 17$
$17 \times 2 - 1 = 33$

Step 2: Find missing term

$33 \times 2 - 1 = 65$

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